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+// -*- C++ -*-
+
+// Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the terms
+// of the GNU General Public License as published by the Free Software
+// Foundation; either version 3, or (at your option) any later
+// version.
+
+// This library is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file parallel/base.h
+ * @brief Sequential helper functions.
+ * This file is a GNU parallel extension to the Standard C++ Library.
+ */
+
+// Written by Johannes Singler.
+
+#ifndef _GLIBCXX_PARALLEL_BASE_H
+#define _GLIBCXX_PARALLEL_BASE_H 1
+
+#include <functional>
+#include <omp.h>
+#include <parallel/features.h>
+#include <parallel/basic_iterator.h>
+#include <parallel/parallel.h>
+
+
+// Parallel mode namespaces.
+
+/**
+ * @namespace std::__parallel
+ * @brief GNU parallel code, replaces standard behavior with parallel behavior.
+ */
+namespace std
+{
+ namespace __parallel { }
+}
+
+/**
+ * @namespace __gnu_parallel
+ * @brief GNU parallel code for public use.
+ */
+namespace __gnu_parallel
+{
+ // Import all the parallel versions of components in namespace std.
+ using namespace std::__parallel;
+}
+
+/**
+ * @namespace __gnu_sequential
+ * @brief GNU sequential classes for public use.
+ */
+namespace __gnu_sequential
+{
+ // Import whatever is the serial version.
+#ifdef _GLIBCXX_PARALLEL
+ using namespace std::__norm;
+#else
+ using namespace std;
+#endif
+}
+
+
+namespace __gnu_parallel
+{
+ // NB: Including this file cannot produce (unresolved) symbols from
+ // the OpenMP runtime unless the parallel mode is actually invoked
+ // and active, which imples that the OpenMP runtime is actually
+ // going to be linked in.
+ inline int
+ get_max_threads()
+ {
+ int __i = omp_get_max_threads();
+ return __i > 1 ? __i : 1;
+ }
+
+
+ inline bool
+ is_parallel(const _Parallelism __p) { return __p != sequential; }
+
+
+ // XXX remove std::duplicates from here if possible,
+ // XXX but keep minimal dependencies.
+
+/** @brief Calculates the rounded-down logarithm of @c n for base 2.
+ * @param n Argument.
+ * @return Returns 0 for any argument <1.
+ */
+template<typename Size>
+ inline Size
+ __log2(Size n)
+ {
+ Size k;
+ for (k = 0; n > 1; n >>= 1)
+ ++k;
+ return k;
+ }
+
+/** @brief Encode two integers into one __gnu_parallel::lcas_t.
+ * @param a First integer, to be encoded in the most-significant @c
+ * lcas_t_bits/2 bits.
+ * @param b Second integer, to be encoded in the least-significant
+ * @c lcas_t_bits/2 bits.
+ * @return __gnu_parallel::lcas_t value encoding @c a and @c b.
+ * @see decode2
+ */
+inline lcas_t
+encode2(int a, int b) //must all be non-negative, actually
+{
+ return (((lcas_t)a) << (lcas_t_bits / 2)) | (((lcas_t)b) << 0);
+}
+
+/** @brief Decode two integers from one __gnu_parallel::lcas_t.
+ * @param x __gnu_parallel::lcas_t to decode integers from.
+ * @param a First integer, to be decoded from the most-significant
+ * @c lcas_t_bits/2 bits of @c x.
+ * @param b Second integer, to be encoded in the least-significant
+ * @c lcas_t_bits/2 bits of @c x.
+ * @see encode2
+ */
+inline void
+decode2(lcas_t x, int& a, int& b)
+{
+ a = (int)((x >> (lcas_t_bits / 2)) & lcas_t_mask);
+ b = (int)((x >> 0 ) & lcas_t_mask);
+}
+
+/** @brief Equivalent to std::min. */
+template<typename T>
+ const T&
+ min(const T& a, const T& b)
+ { return (a < b) ? a : b; }
+
+/** @brief Equivalent to std::max. */
+template<typename T>
+ const T&
+ max(const T& a, const T& b)
+ { return (a > b) ? a : b; }
+
+/** @brief Constructs predicate for equality from strict weak
+ * ordering predicate
+ */
+// XXX comparator at the end, as per others
+template<typename Comparator, typename T1, typename T2>
+ class equal_from_less : public std::binary_function<T1, T2, bool>
+ {
+ private:
+ Comparator& comp;
+
+ public:
+ equal_from_less(Comparator& _comp) : comp(_comp) { }
+
+ bool operator()(const T1& a, const T2& b)
+ {
+ return !comp(a, b) && !comp(b, a);
+ }
+ };
+
+
+/** @brief Similar to std::binder1st,
+ * but giving the argument types explicitly. */
+template<typename _Predicate, typename argument_type>
+ class unary_negate
+ : public std::unary_function<argument_type, bool>
+ {
+ protected:
+ _Predicate _M_pred;
+
+ public:
+ explicit
+ unary_negate(const _Predicate& __x) : _M_pred(__x) { }
+
+ bool
+ operator()(const argument_type& __x)
+ { return !_M_pred(__x); }
+ };
+
+/** @brief Similar to std::binder1st,
+ * but giving the argument types explicitly. */
+template<typename _Operation, typename first_argument_type,
+ typename second_argument_type, typename result_type>
+ class binder1st
+ : public std::unary_function<second_argument_type, result_type>
+ {
+ protected:
+ _Operation op;
+ first_argument_type value;
+
+ public:
+ binder1st(const _Operation& __x,
+ const first_argument_type& __y)
+ : op(__x), value(__y) { }
+
+ result_type
+ operator()(const second_argument_type& __x)
+ { return op(value, __x); }
+
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 109. Missing binders for non-const sequence elements
+ result_type
+ operator()(second_argument_type& __x) const
+ { return op(value, __x); }
+ };
+
+/**
+ * @brief Similar to std::binder2nd, but giving the argument types
+ * explicitly.
+ */
+template<typename _Operation, typename first_argument_type,
+ typename second_argument_type, typename result_type>
+ class binder2nd
+ : public std::unary_function<first_argument_type, result_type>
+ {
+ protected:
+ _Operation op;
+ second_argument_type value;
+
+ public:
+ binder2nd(const _Operation& __x,
+ const second_argument_type& __y)
+ : op(__x), value(__y) { }
+
+ result_type
+ operator()(const first_argument_type& __x) const
+ { return op(__x, value); }
+
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 109. Missing binders for non-const sequence elements
+ result_type
+ operator()(first_argument_type& __x)
+ { return op(__x, value); }
+ };
+
+/** @brief Similar to std::equal_to, but allows two different types. */
+template<typename T1, typename T2>
+ struct equal_to : std::binary_function<T1, T2, bool>
+ {
+ bool operator()(const T1& t1, const T2& t2) const
+ { return t1 == t2; }
+ };
+
+/** @brief Similar to std::less, but allows two different types. */
+template<typename T1, typename T2>
+ struct less : std::binary_function<T1, T2, bool>
+ {
+ bool
+ operator()(const T1& t1, const T2& t2) const
+ { return t1 < t2; }
+
+ bool
+ operator()(const T2& t2, const T1& t1) const
+ { return t2 < t1; }
+ };
+
+// Partial specialization for one type. Same as std::less.
+template<typename _Tp>
+struct less<_Tp, _Tp> : public std::binary_function<_Tp, _Tp, bool>
+ {
+ bool
+ operator()(const _Tp& __x, const _Tp& __y) const
+ { return __x < __y; }
+ };
+
+
+ /** @brief Similar to std::plus, but allows two different types. */
+template<typename _Tp1, typename _Tp2>
+ struct plus : public std::binary_function<_Tp1, _Tp2, _Tp1>
+ {
+ typedef __typeof__(*static_cast<_Tp1*>(NULL)
+ + *static_cast<_Tp2*>(NULL)) result;
+
+ result
+ operator()(const _Tp1& __x, const _Tp2& __y) const
+ { return __x + __y; }
+ };
+
+// Partial specialization for one type. Same as std::plus.
+template<typename _Tp>
+ struct plus<_Tp, _Tp> : public std::binary_function<_Tp, _Tp, _Tp>
+ {
+ typedef __typeof__(*static_cast<_Tp*>(NULL)
+ + *static_cast<_Tp*>(NULL)) result;
+
+ result
+ operator()(const _Tp& __x, const _Tp& __y) const
+ { return __x + __y; }
+ };
+
+
+/** @brief Similar to std::multiplies, but allows two different types. */
+template<typename _Tp1, typename _Tp2>
+ struct multiplies : public std::binary_function<_Tp1, _Tp2, _Tp1>
+ {
+ typedef __typeof__(*static_cast<_Tp1*>(NULL)
+ * *static_cast<_Tp2*>(NULL)) result;
+
+ result
+ operator()(const _Tp1& __x, const _Tp2& __y) const
+ { return __x * __y; }
+ };
+
+// Partial specialization for one type. Same as std::multiplies.
+template<typename _Tp>
+ struct multiplies<_Tp, _Tp> : public std::binary_function<_Tp, _Tp, _Tp>
+ {
+ typedef __typeof__(*static_cast<_Tp*>(NULL)
+ * *static_cast<_Tp*>(NULL)) result;
+
+ result
+ operator()(const _Tp& __x, const _Tp& __y) const
+ { return __x * __y; }
+ };
+
+
+template<typename T, typename _DifferenceTp>
+ class pseudo_sequence;
+
+/** @brief Iterator associated with __gnu_parallel::pseudo_sequence.
+ * If features the usual random-access iterator functionality.
+ * @param T Sequence value type.
+ * @param difference_type Sequence difference type.
+ */
+template<typename T, typename _DifferenceTp>
+ class pseudo_sequence_iterator
+ {
+ public:
+ typedef _DifferenceTp difference_type;
+
+ private:
+ typedef pseudo_sequence_iterator<T, _DifferenceTp> type;
+
+ const T& val;
+ difference_type pos;
+
+ public:
+ pseudo_sequence_iterator(const T& val, difference_type pos)
+ : val(val), pos(pos) { }
+
+ // Pre-increment operator.
+ type&
+ operator++()
+ {
+ ++pos;
+ return *this;
+ }
+
+ // Post-increment operator.
+ const type
+ operator++(int)
+ { return type(pos++); }
+
+ const T&
+ operator*() const
+ { return val; }
+
+ const T&
+ operator[](difference_type) const
+ { return val; }
+
+ bool
+ operator==(const type& i2)
+ { return pos == i2.pos; }
+
+ difference_type
+ operator!=(const type& i2)
+ { return pos != i2.pos; }
+
+ difference_type
+ operator-(const type& i2)
+ { return pos - i2.pos; }
+ };
+
+/** @brief Sequence that conceptually consists of multiple copies of
+ the same element.
+ * The copies are not stored explicitly, of course.
+ * @param T Sequence value type.
+ * @param difference_type Sequence difference type.
+ */
+template<typename T, typename _DifferenceTp>
+ class pseudo_sequence
+ {
+ typedef pseudo_sequence<T, _DifferenceTp> type;
+
+ public:
+ typedef _DifferenceTp difference_type;
+
+ // Better case down to uint64, than up to _DifferenceTp.
+ typedef pseudo_sequence_iterator<T, uint64> iterator;
+
+ /** @brief Constructor.
+ * @param val Element of the sequence.
+ * @param count Number of (virtual) copies.
+ */
+ pseudo_sequence(const T& val, difference_type count)
+ : val(val), count(count) { }
+
+ /** @brief Begin iterator. */
+ iterator
+ begin() const
+ { return iterator(val, 0); }
+
+ /** @brief End iterator. */
+ iterator
+ end() const
+ { return iterator(val, count); }
+
+ private:
+ const T& val;
+ difference_type count;
+ };
+
+/** @brief Functor that does nothing */
+template<typename _ValueTp>
+ class void_functor
+ {
+ inline void
+ operator()(const _ValueTp& v) const { }
+ };
+
+/** @brief Compute the median of three referenced elements,
+ according to @c comp.
+ * @param a First iterator.
+ * @param b Second iterator.
+ * @param c Third iterator.
+ * @param comp Comparator.
+ */
+template<typename RandomAccessIterator, typename Comparator>
+ RandomAccessIterator
+ median_of_three_iterators(RandomAccessIterator a, RandomAccessIterator b,
+ RandomAccessIterator c, Comparator& comp)
+ {
+ if (comp(*a, *b))
+ if (comp(*b, *c))
+ return b;
+ else
+ if (comp(*a, *c))
+ return c;
+ else
+ return a;
+ else
+ {
+ // Just swap a and b.
+ if (comp(*a, *c))
+ return a;
+ else
+ if (comp(*b, *c))
+ return c;
+ else
+ return b;
+ }
+ }
+
+#define _GLIBCXX_PARALLEL_ASSERT(_Condition) __glibcxx_assert(_Condition)
+
+} //namespace __gnu_parallel
+
+#endif /* _GLIBCXX_PARALLEL_BASE_H */
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